RS 232 Interfacing with PIC

[dreamproject]

hi all,

For a project that I am on to , I require that RTS (Request to Send) and DTR ( Data terminal Ready ) be set to "ON" , for a certain device (Mobile phone) to work when connected to a PIC. Does this mean I hook it up to +15 volts or is there a more sinster meaning to this.

Thanks

 

[Papabravo]

What could possibly be sinister about hooking up a pair of signals? Rather than hooking directly to a supply I would use a buffer with its input pulled up or down as appropriate so that your outputs, even though constant, behave like RS-232 signals instead of like power supplies.

 

[philba]

I'd use a max232 or clone. It happens to have 4 drivers on it so you can use 2 for the data and the other 2 for RTS nd DTR. pretty standard application. read the rather massive max232 data sheet from maximic.com

 

[Papabravo]

That's

www.maxim-ic.com

 

[philba]

funny, www.maximic.com works also but does redirect to the dash name...

 

[Papabravo]

Somebody cybersquatted on the maxim.com domian name before maxim did and they must have been uninterested in moving.